Garbell



COMPUTING MACHINES Filed Dec. 4, '1944 6 Sheets-Sheet 1 grwwwtoo MAXGARBELL I 7 I r 9 8fl6gl5lfllzlvj gimme 9 8 7 6 5 4 3 2 in 9 8 7 6 54.3L2 f 9 7 nO Ru AM 3L2 IIKB W p 7 1 ARE 4b 2 3 TH I s L 2 u M'W 7 6 54- h 2 rj F L L FfHF W w I w 1 Feb. 20, 1951 M. GARBELL 2,542,653

SELECTOR uscumxsm FOR REGISTERING COMPUTING MACHINES 6 Sheets-Sheet 2Filed Dec. 4, 1944 gvyuamkvo M AX GARBELL.

Feb. 20, 1951 M. GARBELL 2,542,658

SELECTOR MECHANISM FOR REGISTERING COMPUTING MACHINES Filed Dec. 4, 19446 Sheets-Sheet 3 E I: M

7 QYWWT' M. GARBELL SELECTOR MECHANISM FOR REGISTERING COMPUTINGMACHINES Feb. 20, 1951 6 Sheets-Sheet 5 Filed D60. 4, 1944 L L E B R A GX A M Feb. 20, 1951 M. GARBELL v SELECTOR mscmmxsm FOR REGISTERINGCOMPUTING MACHINES 6 Sheets-Sheet 6 Filed Dec. 4, 1944 Zwuvnfo p MAXGARBELL Patented Feb. 20, 1951 SELECTOR MECHANISM FOR REGISTERINGCOMPUTING MACHINES Max Garbell, Los Angeles, Calif., assignor to RoyalTypewriter Company, Inc., New York, N. 1., a

corporation of New York Application December 4, 1944, Serial No. 566,595

8 Claims; (Cl. 101-93) This invention relates to a computing machine ofthe type embodying a series of type wheels bearing numerical indicia, akeyboard embodying a plurality of banks of keys with each bankcomprising a. series of consecutively numbered keys, selective mechanismfor controlling positioning of the type wheels on depression ofthe'keys, and driving mechanism for actuating the type wheels throughthe medium of the selective mechanism for disposing numerical indicia onone or more of the type wheels in printing position according to theselection made by depressing a key in one or more of the banks thereof.

An object of the invention is to provide an improved construction in theselective mechanism and the associated actuating mechanism such as tofacilitate construction and assemblage of the parts and result in acomputing mechanism that is highly efllcient and durable.

It has heretofore been the practice in the construction of machines ofthe above character to employ systems of links, levers and slide bars inthe selective mechanism and forming these parts with various curves,bends and offsets to the end of converging the selective mechanism froma wide area keyboard to a relatively short length of type wheel assemblyresulting in a large number of differently formed and arranged partsthat are costly in manufacture and assemblage.

A purpose of this invention is to eliminate the use of such complicatedparts and to provide in lieu thereof a simple arrangement of a series ofparallel selector bars one of which is provided for each bank of keys,together with a complementary series of actuator rack bars with gearconnections between the actuator rack bars and the selector bars wherebypredetermined movement of the former will determine movement of thelatter, together with a rack and pinion arrangement for actuating thetype wheels from the actuator rack bars.

Another object is to provide a construction whereby movement of theselective mechanism and the actuating mechanism may be effected from anoperating mechanism through toothed gear connections.

A further object of the invention is to provide a new and improvedmechanism for automatically efiecting printing of a zero in an order inwhich no selector key has been operated when a selector key in the nexthigher order has been operated.

With .the foregoing objects in view, together with such other objectsand advantages as may subsequently appear, the invention resides in the2 parts and in the combination, construction and arrangement of partshereinafter described and claimed, and illustrated by way of example inthe accompanying drawings, in which:

Fig. 1 is a plan view of the machine showing the keyboard and type wheelarrangement;

Fig. 2 is a view in section and elevation as seen on the line 2-2 onFig. '1 in the direction indicated by the arrows with the parts disposedin a normal position;

Fig. 3 is a view in horizontal section and plan taken on the line 3-4 ofFig. 2 with portions removed;

Fig. 4 is a view in horizontal section and plan taken on the line 4-4 ofFig. 2 with portions removed;

Fig. 5 is a view in end elevation of the parts shown in Fig. 4 withportions removed;

Fig. 6 is a detail in elevation and section taken on the line 6-8 ofFig. 4 showing one of the operating units and illustrating the mode ofoperation of the invention;

Fig. 7 is a detail in section and elevation taken on the line 1-1 ofFig. 2 depicting a single unit of the assemblage;

Fig. 8 is a detail in side elevation of a fragmentary portion of thestructure shown in Fig. 6 illustrating the operation of a tension armelement;

Fig. 9 is a detail in section and elevation taken on the line 9-9 ofFig. 2 as seen in the direction indicated by the arrows depicting thekey releasing mechanism;

Fig. 10 is a detail in elevation taken on the line Ill-40 of Fig. 9;

Fig. 11 is a fragmentary plan view as seen on the line llll of Fig. 9showing the means whereby the parts are initially automaticallypositioned to indicate zeros in banks to the right of a bank in which akey is actuated where no numbered key has been operated in a bank to theright;

Fig. 12 is an enlarged sectional view taken on the line 12-" of Fig. 11depicting the mechanism for automatically disposing the zero indicia inprinting position and illustrating in dotted lines the mode of operationthereof.

Referring to the drawings more specifically, A indicates generally akeyboard assembly of conventional character embodying a series of banksB of keys in with the keys in each bank consecutively numbered from 1 to9 inclusive and with the correspondingly numbered keys of the severalbanks arranged in rows C. The keyboard assembly A includes a framestructure D suitably p e N and a bottom plate i3 spaced below the topplate and connected thereto by side walls 14. Each of the keys Iincludes a stem l5 which projects downwardly from the heads ll throughopenings in the top plate 12 of the frame structure D and throughelongated slots l6 in the bottom plate I 3 of the frame D. The stems 15are formed with longitudinally extending guide slots 11, and extendingthrough the slots l1 in the stems of each row C of the keys I0 is aguide rod i8 carried by the frame D. The keys III are normallymaintained in their uppermost or retracted positions by coil springs i9paralleling the rods I8 and passing through the stems l5 and carried bythe frame structure D; the springs I8 and rods 18 being carried by theside walls l4 of the frame D as indicated in Fig. '7.

A narrow slide plate 20 is mounted for longitudinal movement below eachbank B of the keys In each of which plates is provided with a pluralityof longitudinally extending slots 2| through which the key stems l5extend and each slide plate is normally urged in one direction by meansof a pull string 22 extending between the forward end portion of theplate 20 and the forwardmost rod l8; the slots 2| being so formed andarranged that when the plates 20 are in their normal retracted positionsunder the urge of the springs 22 the forward ends of the slots will abutthe forward edges of the stems l5, as particularly shown in Fig. 2.

Formed on the forward edge of each of the stems l5 contiguous the plate20 is a cam-detent 23 embodying an inclined lower face 24 which when thekey is in its normal position abuts at the lower portion thereof withthe forward end of the contiguous key stem receiving slot 2| and whichalso embodies a ledge 25 constituting the upper margin of the cam-detentwhich is adapted to be positioned beneath the slide plate 20 inengagement with the underside of the margin of the key-stem receivingslot 2| when the key is depressed as indicated in full lines in Fig. 6.The inclined face 24 is operable to effect advance of the slide plate 20in opposition to the spring 22 on depression of the key In to effectinterengagement between the slide plate and the ledge 25 whereby the keywill be retained in a depressed position. The depressed keys interlockedwith a slide plate 20 are released from the latter by effecting advancemovement of the slide plate independent of the keys by suitable releasemechanism which will be later described. I

In carrying out my invention I provide a series of selector slide bars21 arranged in parallel relation immediately below the keyboardassembly: there being a slide bar 21 extending longitudinally beneatheach bank B of the keys III with the upper edges of the slide barcontiguous but spaced from the lower end of the key stems 15.

Each of the slide bars 21 embodies an elongated plate positioned withits opposed narrow edges extending upwardly and downwardly. The slidebars 21 are formed contiguous their opposite ends with longitudinallyextending slots 23 and 29 engaged by supporting bars 30 and 3| carriedon the side walls 32 and 33 of a supporting structure H arranged withinthe housing G; the selector slide bars being slidably supported on therods Bill and Iii and being retained in their gar; position by havingtheir forward end portions extended into guide slots 34 formed in across wall 35 extending between and carried by the walls 32 and 33.

Extending transversely beneath the-assembly of selector slide bars 21 isa series of parallel rock shafts 36 which shafts correspond in number tothe selector slide bars. The rock shafts are geared to the selectorslide bars; there being a rock shaft for each slide bar with a segmentalgear 31 on the rock shaft meshing with rack teeth 38 on the lower marginof the associated slide bar. Each of the slide bars is thus providedwith an independent actuating means and whereby any one of the series ofselector slide bars may be shifted longitudinally independently of theothers and whereby the slide bars may be actuated singly or in multipleaccording to which one or more of rock shafts 36 is operated.

The gear connections between the several rock shafts and slide bars areprogressively arranged. As here shown a series of eight selective slidebars is arranged between the supporting walls 32 and 33 and are gearedsuccessively from right to left to the associated eight rock shafts fromthe innermost to the outermost of said shafts.

Arranged beneath the rock shafts 36 is a series of parallel actuatorslide bars 40 extending transversely of the rock shafts in parallelrelation to each other and supported for longitudinal movement on rods4| and 42 slidably engaging longitudinally extending slots 43 and 44 inthe opposite end portions of the actuator slide bars. The slotted endportions of the actuator slide bars 40 extend through guide channels 45and 46 formed on the rods 4| and 42 whereby the bars 40 are maintainedupright.

Formed on each of the actuating slide bars 46 is a rack 46 engaged by atoothed segment 41 carried on one of the rock shafts 36, there being aslide bar 40 for each rock shaft 36. The several actuator slide bars 40are consecutively geared from right to left with the several rock shafts36 from the innermost to the outermost of the latter.

It will now be seen that longitudinal movement of any of the actuatorbars 40 will act through the segmental gear 41 engaged therewith to rockthe associated rock shaft 36 and thereby effect longitudinal movement ofthe associated selector bar 21 through the pinion 31 and rack 38 in adirection opposite the direction of movement of the actuator slide bar40 as indicated by the arrows a and b in Fig. 6.

The inner end of each of the actuator slide bars 40 is formed with anupward extension 48 carrying a rack 49 paralleling the path of travel ofthe actuator bar and which rack 49 meshes with a pinion 50 on a typewheel 5|. A series of the type wheels 5| is thus provided correspondingin number to the actuator bars 40; the type wheels 5i beingindependently revolubly mounted on a shaft 52 with the adjacent typewheels disposed in close relation to each other.

The type wheels 5| are each equipped with a series of printing indicia53 numbered COHSBCU? tively from 1 to 9 inclusive preceded by a zeroindicia c followed by a blank or relief space indicated at d. Normallythe several type wheels are disposed with their complementary indiciaaligned as indicated in Fig. 1 and with the relief spaces d presented tothe printing position.

Means are provided for operating the actuator bars 40, here shown asembodying a rock shaft 54 arranged beneath the actuator bars 48 andextending transversely thereof and on which rock shaft 54 is mounted aseries of segmental gears 55 meshing with toothed racks 56 formed on thelower margins of the actuator bars. The segmental gears 55 are loose onthe rock shaft 54 whereby the latter may be turned without effectingmovement of the segmental gears; a series of tension arms 51 beingfastened on the rock shaft 54 having their outer ends connected to thesegmental gears 55 by pull springs 58 so arranged and 'tensioned that onswinging the arms 51 in opposition to the spring 58 the latter will actto swing the segmental gear 55 in unison with the arm 51 when theactuator rock bars 48 are free to move, but when movement of any of theactuator bars is restrained, as will presently be described, and thesegmental gear 55 engaged therewith be thereby held against movement,swinging of the arm 51 by turning the rock shaft 54 independent of theheld segmental gear will occur by reason of stretch of the spring 58extending between the arm 51 and the held segmental gear. The segmentalgears 55 are normally maintained in their retracted positions by pullsprings 59 having one end connected to the segmental gears 55 and havingtheir outer ends connected to a fixed bracket 60 disposed forwardly ofthe rock shaft 54; the springs 59 acting through the segmental gears 55to restore the bars 21 and 40 to normal.

Any suitable means may be provided for eflecting rocking of the rockshaft 54. The means here shown comprises a pull crank 8| on a shaft 52fitted with an arm 83 having a pin 64 on the outer end thereof engagingan eccentric slot 55 in a rocker arm 66, which is geared to the rockshaft 54; the rocker arm 65 being pivoted at one end as indicated at 61and having rack teeth 88 at the other end thereof extending on an arcconcentric with the pivot 61 which teeth 58 mesh with a spur gear 89 onthe rock shaft 54.

Limiting the advance longitudinal movement of the actuator slide bars 40determines the extent of rotation of the type wheels 5| through thepinions 58 on the type wheels by the racks 49 carried by the actuatorslide bars. This limiting of the movement of the actuator slide bars iseffected by limiting movement of the selector bars 21 and isaccomplished through the medium of the keys ill in the keyboard A. Forthis purpose the upper margins of the selector slide bars 21 are formedwith a series of spaced laterally extending stop lugs 10 with the lugson each selector slide bar so arranged relative to the lower ends of thestems l 5 of the keys III that on depression of a. key to its lowermostposition the lower portion of the stem will protrude into the path of alug 10 so that the lug on abutting the'stem l5 on forward movement ofthe selector bar will arrest such movement at a point determined by theparticular key in a bank thereof having been depressed. The lugs 10 arevaried in their spacing relative to the key stems throughout the lengthof -a selector slide bar with the spacing between the lugs and theirrespective cooperating key stems progressively increased from theforwardmost to the rearwardmost key stem whereby the selector slide barswill have progressively increasing lengths of travel in the numericalorder of the keys; this spacing being such in relation to the gearconnections with the type wheels and the numbered type faces thereonthat when a. key l8 bearing the numeral 1 is depressed, the selector barwill be permitted to move 'a distance such as to allow movement of theactuator bar 48 a distance such as to turn the type wheel associatedtherewith a distance to present the type numeral 1 thereon in printingposition, and so on progressively throughout the series of the numberedkeys in the bank thereof. However, no stop lug In need be provided forthe 9 key since the maximum movement of the selector slide bars may bedetermined by the endsof the slots 28 and 28 abutting the supportingshafts 38 and 3 I.

Each of the selector bars 21 is provided at its inner end portion and onthe upper edge thereof with a rack 1| with which is meshed a toothedsegment 12 turnably supported on a stop member 13 on a shaft 14, thestop member 13 being in the form of a generally circular disk andarranged so that a portion of the peripheral margins thereof will bepresented to the end of a slide bar 28 with which the stop member 13 isaligned. Formed on the stop member 13 is a shoulder 15 arranged tounderlie the inner end portion of the contiguous associated slide bar 28such that when the slide bar is in its normal retracted position thestop member 13 will be held against rotation thereby operating throughthe segment 12 and rack 1| to hold the selector bar against longitudinalmovement and accordingly holding the companion actuator bar againstmovement through the gear connection between the selector bar and theactuator bar until the slide bar 20 is advanced so as to free theshoulder 15 Of a stop member 13 associated with the advanced slide bar.The associated selector bar 21 will then be free to move to an advancedposition during which movement the stop member 13 will be rotated tomove the shoulder 15 past the inner end of the slide bar. The shoulder15 is formed with a notch 16 adapted to receive the end of the slide bar20 on the latter being slightly advanced in order to permit initialmovement of the selector and actuator bars a distance suflicient to turnthe type wheel 53 to present the zero indicia c thereon to printingposition.

A rock shaft 11 is arranged on a plane above and slightly forward of theshaft 14 on which is mounted a series of depending fingers 18 forengaging the inner ends of the slide bars 28. The rock shaft 11 isjournalled in the side walls 32 and 33 and its outer end extends throughthe former and is fitted with a depending arm 19 normally maintainedunder the pull of a spring against the upper end 8| Of a lever 82pivoted at 83. The lever 82 is formed with a downwardly extending lowerend 84 which carries a spring snap 85 pivoted at 88 on the lever 82 andhaving 9. depending lower end portion 81 normally extending in the pathof a finger 88 on the rock shaft 62. The finger '88 is desi ned onturning the rock shaft 62 in a forward direction to ride past the ends81 of the latch 85 into the dotted line position shown in Fig. 10 inwhich operation the snap 85 swings in opposition to its spring 88; thearm 88 then being adapted to engage the snap 85 on its return movementand effect rocking of the lever 82 so as to swing the arm 19 inopposition to the spring 80 and rock the rock shaft 11 in a direction tocause the fingers 18 thereon to advance the slide bars 29 thereinreleasing any depressed push button Ill so that the latter may berestored to normal. A bend 38 on the snap 85 engages an edge of thelever 82 to limit movement of the snap in one direction. A stop pin 9|forms an abutment for the upper end of the lever a: to limit movementthereof in one direction under the urge of the spring 80 and finger I9.

Each of the slide bars to the left of the one at the extreme right ofthe assembly is formed with a lateral projection 82 which extend infront of and in spaced relation to a shoulder 93 on the slide bar 20 tothe right thereof whereby on advancing any of the slide bars carryingthe projection 92 the latter will be caused to engage the shoulder 93and cause a slight advance of the slide bar 20 to the right of the oneinitially actuated. This operation moves the inner ends of the slide barto the right of the initially operated one a distance sufllcient toclear the shoulders 15 on the sleeves 13 yet not sufllcient to clear thenotch 16 thereby permitting slight turning movement of the associatedstop member 13, thus freeing the associated selector bar and slide barsfor such initial movement as to effect turning of the type wheel 50 todispose the zero indicia c to printing position.

In the operation of the invention, on depression of a key I in any bankthereof, a key pin in any bank thereof will effect snap engagement ofthe slide bar 20 with the depressed key stem as before described and asshown in full lines in Fig. 6. In this operation the slide bar 20 willbe advanced by the inclined face 24 on the detent 25 and will beretained in a partly advanced position by reason of the upper portion ofthe stem l being wider than the portion normally engaged with the end ofthe slot 2| in the slide bar 20 so as to hold the inner end of the slidebar clear of the shoulders 15-16 on the stop member I3, thereby freeingthe latter. The lower end of the key stem IE will then be presented inthe path of one of the lugs on a selector slide bar 21.

On turning the operating rock shaft 54 as through the medium of thecrank 6| the actuator slide bar 40 will advance as before describedaccording to the limitations imposed by projection of the depressed keystem into the path of travel of the lug 10 thereby operating theassociated type wheel 53 to turn the latter to present to printingposition a numerical indicia thereon corresponding to that carried bythe depressed key.

Depression of any key in the first bank to the right of the assemblywill release its associated actuator bar 40 to turn the type wheel topresent the selected numerical indicia thereon to its printing position.Likewise depression of any key in any of the other banks of keys willrelease its associated selector bar for actuation of its associated typewheel in like fashion. Where no key is depressed in the bank to theright of a bank in which a key is depressed the selector associated withthe non-selector bank next adjacent the selected bank will be free tomove the short distance necessary to dispose the zero indicia on theassociated type wheel in printing position and which operation isoccasioned by the provision of the second stop afforded by the notch 16on the stop member 13.

By the provision of the tension arm 5! connecting the actuator rockshaft 54 with the tooth segment 55 for actuating the selector bars 40the several selector bars will be advanced on rocking the rock shaft 54a distance according to the limitation of their travel afforded eitherby the stop member 13 or cooperation of the stems IS with the lugs 10 onthe selector bars.

After the printing operation has been effected in the conventionalfashion not here shown, which as is common in machines of thischaracter,

8 is accomplished on a downward pull imparted to the crank 6i, returnmovement of the crank will operate through the lever 82 to rock the rockshaft 11 and thereby cause the fingers 58 to shove any operated slidebars Ill out of engagement with stop members 18 so as to permit thedepressed keys to return to normal. The springs 22 will restore theslide plates III to normal and spring I! acting through the segmentalgears 55 will restore the slide bars 40 and 21 to normal while movementof the selector bars 4| to normal will restore the type wheels tonormal.

While I have shown and described a specific embodiment of my invention Ido not limit myself to the exact details of construction set forth, andthe invention embraces such changes, modifications and equivalents ofthe parts and. their formation and arrangement as come within thepurview of the appended claims.

I claim:

1. In a computing machine, a plurality of parallel longitudinallymovable actuator bars, an operating rock shaft extending transverselybeneath said actuator bars, a series of segmental gears complementary tothe series of ,actuator bars on said rock shaft and relative to whichsaid shaft is turnable, rack teeth on said bars engaged by saidsegmental gears, spring means normally maintaining said segmental gearsin retracted position, arms fixed on said rock shafts, tension pullsprings connected between said arms and segmental gears, numericalregistering means, means for operating said registering means bymovement of said actuator bars, and key controlled means for selectivelylimiting the length of travel of each of the actuator bars.

2. In a computing machine, an operating rock shaft, 9. series of armsfixed on said shaft, a segmental gear on said shaft alongside each ofsaid arms, relative to which said rock shaft is turnable, a yieldableconnection between each of said arms and its companion segmental gear,an actuator slide bar adjacent each of said segmental gears, rack teethon said bar engaged by the adjacent segmental gear, means for supportingand guiding said actuator bar for longitudinal movement, a type wheelassociated with each actuator bar, gear connections between the typewheel and its associated actuator bar whereby longitudinal movement ofthe actuator bar will effect rotation of the type wheel, means fornormally holding said actuator bars against longitudinal movement. keycontrolled means for freeing said actuator bar holding means to permitlongitudinal movement of said actuator bars, and means associated withsaid key controlled means for limiting the length of the path of travelof said actuator bars to various distances.

3. In a computing machine, an operating rock shaft, a series of armsfixed on said shaft, a segmental gear on said shaft alongside each ofsaid arms relative to which said rock shaft is turnable, a yieldableconnection between each of said arms and its companion segmental gears,an actuator slide bar adjacent each of said segmental gears, rack teethon said bar engaged by the adjacent segmental gear, means for supportingand guiding said actuator bar for longitudinal movement, a type wheelassociated with each actuator bar, gear connections between the typewheel and its associated actuator bar whereby longitudinal movement ofthe actuator bar will effect rotation of the type wheel, means fornormally holding said actuator bars against longitudinal movement, keycontrolled means for freeing said actuator bar holding means to permitlongitudinal movement of said actuator bar, a series of selector slidebars each of which is associated with one of said actuator bars, gearconnections between a selector bar and its associated actuator bar, andmeans on said selector bar associated with said key controlled means forlimiting the length of travel of said actuator bars to variousdistances.

4. In a computing machine, a plurality of type wheels, a reciprocalactuator bar associated with each of said wheels, means forreciprocating said actuator bars, means for rotating said type wheelsfrom said actuator bars, a reciprocal selector bar associated with eachactuator bar, connections between each slide bar and an associatedactuator bar, a slide bar associated with each selector bar, a turnablestop member at the inner end of each slide bar, gear connections betweensaid stop members and associated actuator bars, a shoulder on each ofsaid stop members engageable with the end of the adjacent slide bar forholding said stop member against turning while the slide bar is in itsnormal position, selective key controlled means for shifting said slidebars out of engagement with said shoulders to release said stop members,and means associated between said selector bars and said key controlledmeans for predetermining the length of travel of said actuator barsv 5.In a computing machine, a plurality of actuator slide bars, means forreciprocating said actuator bars, a complementary series of selectorbars independent movement transmitting connections between each of saidactuator and one of said slide bars, means engaging each of said slidebars engaged by a selector bar to hold the latter stationary, keycontrolled means for shifting said slide bars to release said engagingmeans, means interengaging adjacent slide bars whereby advance movementof a slide bar will effect shorter advance movement of an adjacent slidebar, and means on said engaging means for partly releasing it o shortadvance of its associated slide bar to permit initial short movement ofthe associated selector and actuator bars, a printing wheel for eachactuator bar carrying zero indicia, and driving means connecting theactuator bars to said printing wheels operable to turn the respectiveprinting wheels to dispose the zero indicia in printing position on theaforesaid initial short movement of an associated actuator bar.

6. In a computing machine-a series of selector slide bars, a companionseries of actuator slide bars, means for reciprocating said actuatorslide bars, gear connections between said selector bars and actuatorbars, rack teeth on said selector bars, stop members having gearsegments meshing with said rack teeth, a pair of adjacent shoulders oneach of said stop members, a slide bar said key controlled means forlimiting the length of travel of said selector bars.

7. In a computing machine a frame, a plurality of parallellongitudinally movable key limited slide bars having key stops thereon,keys on the frame cooperable with said key stops, a series of parallelactuator slide bars and a type whee] adapted to be actuated by each saidactuator slide bar, a gear member between each key limited slide bar andthe respective actuator slide bar having agear connection to eachrespective slide bar, means for actuating the actuator slide barsdistances limited by. the key setting of the key limited slide bars, andan intermittent delayed action spring driven actuator for each actuatorslide bar, each said last actuator comprising a shaft on the frame, atension arm rotatably mounted thereon, a segmental gear independentlyrotatable on the shaft and having a geared connection with the actuatorslide bar, a tension spring between the tension arm and the segmentalgear adapted to move said segmental gear in response to movement of thetension arm, and a type wheel responsive to each actuator slide bar.

8. In a computing machine a frame, a plurality of parallellongitudinally movable actuator slide bars thereon, a series ofcomplementary longitudinally movable key limited slide bars on theframe. a series of keys cooperable with each said key limited slide bar,a free floating gear means and support therefor carried by the frame ata location between and transverse to each actuator slide bar and thecomplementary key limited slide bar, said gear means having a gearconnection of one ratio with the actuator slide bar and a gearconnection of another ratio with the key limited slide bar, a type wheelresponsive to actuation of each actuator slide bar, mean adapted toactuate said actuator slide bars through distances limited by said keylimited slide bars, a

slide plate for each key limited slide bar having slots adapted to admitthe keys, a lateral projectionon each slide plate and a shoulder on theslide plate next adjacent and engageable therewith, the spacing betweenprojection and shoulder being progressively greater from one extremeslide plate to the other, and a zero gear stop means comprising atransverse shaft spaced endwise from the slide plates, a freely rotatinggeared element on the shaft for each slide plate in rack and gearengagement with the respective actuator slide bar and a projection onthegeared element engageable with the slide plate at zero position of theslide plate and adapted to arrest movement of the actuator slide bar.

- MAX GARBELL.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,224,873 Walter May 1, 19171,241,140 Nicholson- Sept. 25, 1917 1,742,053 Ball Dec. 31, 19291,790,790 Breitling Feb. 3, 1931 2,082,282 Garbell June 1, 19372,384,789 Crosman May 16, 1944 2,361,260 Buehler Oct. 24, 1944 2,418,0277 Gubelman Mar. 25, 1947

